Compost is a natural fertilizer made from decomposed organic matter, such as food scraps, yard waste, and manure.

Urea is a synthetic fertilizer made from ammonia and carbon dioxide.

Nitrogen, phosphorus, and potassium are all macronutrients, which are essential for plant growth.

Iron, zinc, and copper are all micronutrients, which are needed in small amounts for plant growth.

Urea is a common source of nitrogen fertilizer because it is a concentrated source of nitrogen and is relatively inexpensive to produce.

Superphosphate is a common source of phosphorus fertilizer because it is a concentrated source of phosphorus and is relatively inexpensive to produce.

Potassium chloride is a common source of potassium fertilizer because it is a concentrated source of potassium and is relatively inexpensive to produce.

Nitrogen fertilizers can contribute to water pollution by causing eutrophication, air pollution by releasing nitrous oxide, and climate change by releasing nitrous oxide and carbon dioxide.

Phosphorus fertilizers can contribute to water pollution by causing eutrophication.

Potassium fertilizers do not have any significant environmental impacts.

All of these practices can help to reduce the environmental impact of fertilizers.

All of these practices can contribute to the environmental impact of fertilizers.

Nitrogen-fixing bacteria play a crucial role in the nitrogen cycle by converting nitrogen gas into ammonia, which can then be used by plants.

Denitrifying bacteria play a crucial role in the nitrogen cycle by converting nitrate into nitrogen gas, which is released into the atmosphere.

Manure can contribute to water pollution by causing eutrophication, air pollution by releasing ammonia and methane, and climate change by releasing methane.